net: bcmgenet: stop Tx NAPI before disabling the queues
bcmgenet_netif_stop() and the Wake-on-LAN branch of bcmgenet_suspend()
both disable the Tx queues first and stop Tx NAPI several steps later. A
completion in flight calls netif_tx_wake_queue() in between, and nothing
stops the queue again, so a transmit can reach the rings after they have
been freed.
Close is safe because dev_deactivate_many() stops the qdisc first.
bcmgenet_suspend() does not, so stop Tx NAPI before the queues on both
paths.
KASAN on a Raspberry Pi CM4, driven from an MTU change because suspend
freezes user space before the callback runs:
BUG: KASAN: use-after-free in bcmgenet_xmit+0x17f8/0x2258
Write of size 8 at addr ffffff8055844a68 by task ksoftirqd/0/14
bcmgenet_xmit+0x17f8/0x2258
dev_hard_start_xmit+0x13c/0x588
sch_direct_xmit+0x108/0x340
__dev_queue_xmit+0x1190/0x3848
Metrics
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Solution
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Workaround
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Sun, 18 Oct 2026 18:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-416 |
Sun, 18 Oct 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | In the Linux kernel, the following vulnerability has been resolved: net: bcmgenet: stop Tx NAPI before disabling the queues bcmgenet_netif_stop() and the Wake-on-LAN branch of bcmgenet_suspend() both disable the Tx queues first and stop Tx NAPI several steps later. A completion in flight calls netif_tx_wake_queue() in between, and nothing stops the queue again, so a transmit can reach the rings after they have been freed. Close is safe because dev_deactivate_many() stops the qdisc first. bcmgenet_suspend() does not, so stop Tx NAPI before the queues on both paths. KASAN on a Raspberry Pi CM4, driven from an MTU change because suspend freezes user space before the callback runs: BUG: KASAN: use-after-free in bcmgenet_xmit+0x17f8/0x2258 Write of size 8 at addr ffffff8055844a68 by task ksoftirqd/0/14 bcmgenet_xmit+0x17f8/0x2258 dev_hard_start_xmit+0x13c/0x588 sch_direct_xmit+0x108/0x340 __dev_queue_xmit+0x1190/0x3848 | |
| Title | net: bcmgenet: stop Tx NAPI before disabling the queues | |
| First Time appeared |
Linux
Linux linux Kernel |
|
| CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Linux
Linux linux Kernel |
|
| References |
|
Projects
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MITRE
Status: PUBLISHED
Assigner: Linux
Published:
Updated: 2026-10-18T15:18:39.767Z
Reserved: 2026-09-25T10:25:14.358Z
Link: CVE-2026-98574
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-10-18T16:17:09.703
Modified: 2026-10-18T16:17:09.703
Link: CVE-2026-98574
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-10-18T18:00:10Z